Or HaChaim on Exodus 33:19/אור החיים על שמות ל״ג:י״ט

1 אני אעביר כל טובי על פניך, "I will make all My goodness pass before you, etc." G'd referred to all His "positive" attributes which he employs for the benefit of His creatures. When G'd added the words על פניך, this is the reason for G'd doing what He said He was about to allow Moses to perceive. Moses' פניך, is a reference to the manner in which Moses had achieved the intimacy with G'd thus far, as we explained earlier.

2וקראתי בשם השם לפניך, "and I will proclaim the name of G'd before you." G'd announced to Moses that He would "parade" each of His attributes before him identifying them by name; it is possible, that G'd meant that He would explain to Moses that all these attributes were in fact part of the INEFFABLE name. There is no greater revelation man can experience than to have all this explained to him by means of his sense of hearing.

3When G'd added: וחנותי את אשר אחון, "I will be gracious to whom I choose to be gracious to," this was a hint that Moses' timing to ask for such revelations was particularly appropriate.